<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
  <script src="https://cdn.bootcdn.net/ajax/libs/dayjs/1.11.7/dayjs.min.js"></script>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
  <style>
    .red{
      color: red;
    }
  </style>
</head>
<body>
  <div id="app">
    <div class="container">
      <!-- 顶部搜索框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-for="(item,index) in list" :key="item.id">
          <tr >
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red:item.price>100}">{{item.price}}</td>
            <td>{{dateFormate(item.time) }}</td>
            <td><a href="#" @click="del(item.id)">删除</a></td>
          </tr>
        </tbody>
        <tr style="background-color: #EEE">
            <td>统计</td>
            <td colspan="2">总价: {{ allPrice }}</td>
            <td colspan="2">均价: {{ avgPrice }}</td>
          </tr>
        <tfoot v-if="list.length<0">
          <tr>
            <td colspan="5" style="text-align: center" >暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model.trim="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="add">添加资产</button>
      </form>
    </div>
  </div>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        list:JSON.parse(localStorage.getItem('data',)) || [],
        name: "", // 名称
        price: "", // 价格
        // list: [
        //   { id: 100, name: "外套", price: 199, time: new Date('2010-08-12')},
        //   { id: 101, name: "裤子", price: 34, time: new Date('2013-09-01') },
        //   { id: 102, name: "鞋", price: 25.4, time: new Date('2018-11-22') },
        //   { id: 103, name: "头发", price: 19900, time: new Date('2020-12-12') }
        // ]
      },
      methods:{
            del(id){
                this.list=this.list.filter(item=>item.id!==id)
            },
            add(){
                if(this.name===''){
                    return alert('资产名称不能为空')
                }
                if(typeof this.price!=='number'){
                    return alert('请输入数值')
                }
                let id = this.list.length > 0 ? this.list[this.list.length - 1].id + 1 : 100

                return this.list.push({
                    id:id,
                    name:this.name,
                    price:this.price,
                    time: new Date('2018-11-22')
                })
                this.name='',
                this.price=''
            },
            dateFormate(val){ 
                return dayjs(val).format("YYYY-MM-DD")
            },
      },
      computed:{
        allPrice(){
            return parseInt(this.list.reduce((sum,item)=>  sum+item.price,0))
        },
        avgPrice(){
            return parseInt(this.allPrice/this.list.length)
        }
      },
      watch:{
        list:{
            handler(newArr){
                localStorage.setItem('data',JSON.stringify(newArr))
            },
            deep: true,
            immediate: true
        }
      }
    })
  </script>
  
</body>
</html>